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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function * gen(arg){
            console.log(arg);
            let one = yield 111;
            console.log(one);
            let two =yield 222;
            console.log(two);
            let three = yield 333;
            console.log(three);
        }

        let iterator = gen('aaa');
        console.log(iterator.next());
        // next方法可以传入实参 作为上一个yield语句返回的结果
        console.log(iterator.next('bbb'));
        console.log(iterator.next('ccc'));
        console.log(iterator.next('ddd'));

    </script>
</body>
</html>